A hundred-year-old oak at Petrova Niva ("Peter's field")- a historic area in the Strandzha mountains of southeastern Bulgaria. "Petrova niva" is located north of the village of Stoilovo (municipality of Malko tarnovo). It is known as place where in 1903 was held a meeting of VMRO (Secret Macedonian-Adrianople Revolutionary Organization) and when a decision for the Preobrazhenie uprising was taken.

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